3.1.2 Fontification of quotes

Text in quotation marks is displayed with the face
font-latex-string-face. Besides the various forms of opening and
closing double and single quotation marks, so-called guillemets (<<, >>)
can be used for quoting. Because there are two styles of using
them—French style: << text >>; German style: >>text<<—you can
customize the variable font-latex-quotes to tell font-latex
which type you are using if the correct value cannot be derived from
document properties.

User Option:font-latex-quotes

The default value of font-latex-quotes is ‘auto’ which means
that font-latex will try to derive the correct type of quotation mark
matching from document properties like the language option supplied to
the babel LaTeX package.

If the automatic detection fails for you and you mostly use one specific
style you can set it to a specific language-dependent value as well.
Set the value to ‘german’ if you are using >>German quotes<< and to
‘french’ if you are using << French quotes >>. font-latex will
recognize the different ways these quotes can be given in your source
code, i.e. (‘"<’, ‘">’), (‘<<’, ‘>>’) and the
respective 8-bit variants.

If you set font-latex-quotes to nil, quoted content will not be
fontified.